What are the sections of a ramp meter signal?

Ramp meter signals are designed to control the flow of traffic entering a freeway, improving overall traffic management and helping to reduce congestion. The primary components of a ramp meter signal typically include two main aspects: a red signal indicating that vehicles must stop, and a green signal indicating that vehicles may proceed onto the freeway.

The correct answer reflects these fundamental aspects of ramp meter signals, incorporating both the circular red and circular green lights. The circular red light serves to halt vehicles when they cannot safely merge onto the freeway, while the circular green light allows vehicles to enter the freeway in a controlled manner, ensuring that the traffic flow remains safe and orderly.

Other options may suggest different combinations or types of signals that do not accurately represent the standard configuration of ramp meter signals, which primarily use circular lights in red and green to convey these specific stop-and-go instructions for vehicles waiting at the ramp. This understanding of ramp meter signals aligns with traffic management principles aimed at optimizing freeway access and minimizing delays.